Bogging under acceleration
08-14-2022, 06:46 PM
#1
Junior Member
Thread Starter
Join Date: Jan 2022
Posts: 10
Likes: 0
Received 0 Likes
on
0 Posts
Bogging under acceleration
Hey everyone, I've been chasing an issue with my firebird for almost two years now. I can idle (it's sporadic) and accelerate (but I have to be slow, if I stomp on it from idle it'll bog and then choppily climb in revs). I also have starting issues, I have to feather the throttle for it to settle at idle. I've replaced the tps (and set it to the correct voltage and verified that it climbs linearly) and put bosch 3's in trying to chase this. It definitely runs better than it did before, but nowhere near "normal". It idles ok and wont die on its own. When i stomp on it theres a sort of "spelunking" noise that comes from the intake and a sudden increase in intake suction that quickly drops as it bogs. After the bogging it'll climb in revs but it's choppy. Does this seem more like a vacuum leak issue or a fuel starvation issue? The only fuel component left to replace is the fuel pump itself... but if it's not the problem I'm not trying to drop the whole rear end of the car lol. Any tips would be appreciated, it seems sort of like what Kincer described in recent posts, but different enough that I'd love some help. Thanks!
08-14-2022, 06:59 PM
#2
Supreme Member
Re: Bogging under acceleration
Check fuel pressure, checking for vacuum leaks would also be a good idea.
08-14-2022, 07:05 PM
#3
Member
Join Date: Jun 2020
Location: Western Pa
Posts: 189
Received 98 Likes
on
54 Posts
Car: 1989 Trans Am
Engine: 305 H.O. TPI
Transmission: Auto 700R4
Axle/Gears: 3.42 posi
Re: Bogging under acceleration
Hey everyone, I've been chasing an issue with my firebird for almost two years now. I can idle (it's sporadic) and accelerate (but I have to be slow, if I stomp on it from idle it'll bog and then choppily climb in revs). I also have starting issues, I have to feather the throttle for it to settle at idle. I've replaced the tps (and set it to the correct voltage and verified that it climbs linearly) and put bosch 3's in trying to chase this. It definitely runs better than it did before, but nowhere near "normal". It idles ok and wont die on its own. When i stomp on it theres a sort of "spelunking" noise that comes from the intake and a sudden increase in intake suction that quickly drops as it bogs. After the bogging it'll climb in revs but it's choppy. Does this seem more like a vacuum leak issue or a fuel starvation issue? The only fuel component left to replace is the fuel pump itself... but if it's not the problem I'm not trying to drop the whole rear end of the car lol. Any tips would be appreciated, it seems sort of like what Kincer described in recent posts, but different enough that I'd love some help. Thanks!
12-30-2022, 08:08 PM
#5
Junior Member
Thread Starter
Join Date: Jan 2022
Posts: 10
Likes: 0
Received 0 Likes
on
0 Posts
Re: Bogging under acceleration
It's been a minute... finally back from school long enough to work on the car. Fuel gauge hooked up. Key in "ON" position yields 10-15 psi! Should be between 42-47 right?? Seems like a Fuel pump change should be in order right?
12-30-2022, 08:48 PM
#6
Supreme Member
Re: Bogging under acceleration
More like 38-43 psi, but yeah if it isn't getting close to that then you most likely have a dying fuel pump.
Trending Topics
01-06-2023, 04:01 PM
#8
Junior Member
Thread Starter
Join Date: Jan 2022
Posts: 10
Likes: 0
Received 0 Likes
on
0 Posts
Re: Bogging under acceleration
Welp, that did it. Runs mint now! Dropping the fuel tank wasn't as bad as people made it out to be lol, definitely easier with another person present though.
Thread
Thread Starter
Forum
Replies
Last Post